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C. N. FAUBEL.

LOCK NUT.

APPLICATION FILED FEB. 29, 1912.

Patented Aug. 22, 1916.

wi/htmw Y Wi t 1114b rf/A :"10 all whom 'tt may concern:-

UNiTED STATES PATENT OFFICE.

CHARLES NICHOLASFAUBEL, or LITTLE ROCK, ARKAn s as.

\ 4 i OCK-NUT.

1 lie-145$ lle'it known that l GIL-\RLES NICHOLAS I luuuc'n, a citizen of the United States, re-

siding at Little liorlg i'nt the county of 'Ilulaski and Stateof Arkansas, have inyented certain new and useful I niprovemutants in Loclc-Nuts of whit-lithe followin is a specification.

This inveutu'nr,relates to improvements -in lock-nuts, and more particularly to that class of de ices in which an internally threaded nut of spiral foru'i is screw-"ed upon a bolt for locking the two parts together, in which position the nut isheld by pressure-contact of the ,sermwthreads resulting from axial expansion or contraction of the coils of'thc nut, together with a key or other means for securing the parts in a fixed position. I T 5 i As heretofore .ro'nstructed devi ces 0f the rlniraeler referred to in ro-been unsatisfactory and objectionable in. use, because of their liability .to, inutilate' or" injure the threat-ls of thebolt or nut, reiideriiig'it impossible to unscrew the nuti a-nd also on .account "of' the difficulty experienced in screwing upor. unscrewing the nutagainst it gradually increasing re stance-as the nut expands or coutracts with consequent muti-' lation of the threads. or the necessity for using-some auxiliary lerice or special means for holding the coils compressed whenscrewed upon the bolt, and then allowing the nut to expaiuhor causing the COl'lS of an expanded nut to contractand force the threads into tight embrai'ze or binding conment in case the material to be held to gether should become loos: by use or shrinkage, and which may beiscrewed on or off the bolt without injuring the threads of either the. bolt or the nut; the nut of itself and without other means providihe a secure fastening, which will not permit it to move without the application of considerable force sullieient to turn it;

The invention will first e hereinafter more particularly described with reference to the accompanying drawings, which are to be taken as a part of this specification and Specification of Letters Patent.

Application on February 29. 1912. Serial No. 680,628.

the applicationoi a wreneh oiiotli will a l ways Patented A'ug. 22,

then pointed out in the of tin-description. e In said drawings .l igure, 1 represents end \'iew of a nut constructed in accordance e0 with my inrention Fig. is an edge View of the same; Fig. 3 is a plan view-ofithe threaded bolt and a transverse section of the nut, illustratil'ig said parts in'po'sition' for assembling and Fig. :i. is an'en'd View sli'owin; the 'nut screwed upon-the bolt.

.ll(:fel"l?illg to said drawings, jHiWiliCll the samereference letters are used toilesigmfite 'eorresponrlihe parts in differentviews, the letter denotes a bolt of ordi-naryseon-i struetion or standard inake a nd Bj-zr-nut' haringprefera ly two or more coilsand iuteriorl tapered and threaded or-tapped with a taper tap; the opening; through the nut being larger at its inner rind' Ii'iiild taelaiins at poring: slightly toward its outerzendg sqth'at inlay-be necessary to-perinit -it t o' b'e s'erwed upon the bolt and at the s'a'ine tim d a firm, grip that willlloeli;thetwofpi gether and, render it i'iuposisible to" nut rith'er forward or"back\\taid',

ll p y with suliicien t force-tojovereonieth '35 ance or binding force of'oont' t) tween the screw threads exerted 'at afn angle-'tothe axis. To this end, the coils of fthe iiutjarev compressed when ,tlii 'ea.ded"or ta'p" e df hnd reinain compressed; has 7 the ame pitch'as threads of the nut ,arerof the -those of the bolt, so thatth'e e isno-tend cncy to separate-the coils -in serewingtlie nut upon the bolt or. unscrewing the 'same.

As illustrated in Fig. 3 of the drawings, the threaded opening presented to receivethe end of the bolt isof the same-size as said bolt at that end of the nut,- but is reduced in size toward the other'end 'f )that as the nut is screwed upa firm grip-or holdibo is secured by the time. the fai'tli'erinost endof the nut is reached, andeontinuedvztuining from that point requires extraordinary:force. beyond the power of the human -liandtoexert thus affording a very Secureloeking connection which will not work loose'orget out of order. Such construction also has the advantage of preventing the scre\\threads of either the bolt or out from being mutilated, and overcomes the diflicultieshereto lore experienced in usin devices of this character, due to the axialiexpansionof the nut and the difference in pitch between the threads of'the screw and bolt, which not only renders it difficult to screw ahel nut upon a bolt a sufficient distance to etfect the desired connection but destroys the screw-threads and also renders it exceedingly diflicult, if not impossible, to unscrew the-nut, at least after it has been in use for .some time, and when such parts are removed they are of no further use, by. reason of the mutilation of the screw-threads.

My improvement also overcomes the objectionsincident to the use of some special device, such as a clamp or other means for holding the coils of the nut in compressed position while it is being screwed upon the bolt, or means for effecting axial expansion orcontraction ofthe nut either before or after-it has been screwed upon the bolt, and allows sufficient freedom or play between the threads of the nut and bolt to. enable the nut to be screwed on without mutilating the screw-threads.

.It will be observed that the nut is divided or split radially so as toform a coil or coils having a main body portion of comparatively great width which graduall diminishes in width toward both ends 0 the coil which terminate abruptly abutting against shoulders on the thick intermediate portion of; the nut, thus imparting the required strength and rigidity with sufiicient resili- .ency..to adapt the nut to bind hvithgreat. force radially and yet prevent lateral-expan sion', ,while the threaded portion of the-bolt is of uniform diameter throughout and of thesam size as the entrance end of the opening through {the nut, though larger than said opening at its other end, and that the screw threads of the nut are of the same pitch as those of the bolt, so that when the I nut is screwed on it will tightly .grip the bolt and will expand radially only without separating the coil'or spreading the split portions of the nut apart and thereby in uring the screw threads. Thus a very firm hold is secured by the nut which cannot be removed without using a wrench or. other suitable tool and consequently the screw' threads of the boltand nut will not be injured in screwing or unscrewing the nut.

Having thus described my-invention', what I claim as new and desire to secure by Letters Patent of the United States is A nut lock comprising a bolt having a threaded portion of uniform diameter 'which end abruptly and abut shoulders or abutments' on said intermediate portion, whereby'strength and rigidity are combined with suflicient resiliency to permit the nut to expand radially while'preventing lateral expansion thereof and adapt it to firmly grip the bolt and interlock therewith, substantially as described.

In testimon whereof I afiix my signature, in presence'o 'two'w'itnesses CHARLES NICHOLAS 'FAUBEL. Witnesses}; 1

Eow; B OUNIE, J nos- P. STREEPEY. 

